I've been critical of their indie-fixation in the past, but these years could all produce some great shit.
1997: Yo La Tengo, Sleater-Kinney and Built to Spill all released seminal indie-rock albums this year. There's also Lonesome Crowded West, and the Blur s/t. Not considering OKC or Ladies and Gentlemen, We Are Floating In Space as they've both been recently reissued.
1999: Blur (13) and Jimmy Eat World (Clarity) stick out to me as big '99 releases they could feasibly do. Could also be Dismemberment Plan (Emergency & I) Built To Spill (Keep it Like a Secret) or maybe Sleater-Kinney (The Hot Rock, but that'd be a strange one to pick).
2012: Keeping the definition of "Indie Rock" a little more strict here, it could be Japandroids (Celebration Rock) Cloud Nothings (Attack on Memory) or Parquet Courts (Light Up Gold). All were huge Indie rock releases that year. Could be Tame Impala. They've already done Grizzly Bear and Dirty Projectors so I'm counting those out. I hope it's The Walkmen-Heaven but that's probably not it.